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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '762da99f85480c5b6cc102375edd7c55b453e96d0810c3579fdd818d8df97502' 
  AND token = '1oGyg76fKcbJYO6ySy+jURdKXufJhJ8vav9yrR+PzTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}